Will this fit my bike?

Only if your frame uses a thru axle with 1.75mm thread pitch and a 174mm or 180mm length. Measure your current axle and check the frame spec before ordering.

Does it come with the trailer hitch?

No. You use the hitch supplied by your trailer maker, such as Thule/Chariot, Burley, InStep or Croozer.

What is the spacer for?

The 6mm flat spacer shortens the effective length from 180mm to 174mm, so one axle covers two frame widths.

What tools do I need?

A 5mm Allen wrench is enough to install or remove it.

Can I leave it on for normal riding?

Yes. It replaces your stock axle and works as a regular thru axle when no trailer is attached.

Is it strong enough for a loaded child trailer?

It is machined and tested in the USA for trailer use, but stay within your bike and trailer makers' weight limits.

Robert Axle Project The Robert Axle Project Kid Trailer Thru Axle

Q: Where is the Robert Axle Project The Robert Axle Project Kid Trailer Thru Axle cheapest?

At Tree Fort Bikes, for $51.99, as of our latest check.

Q: Where can I buy the Robert Axle Project The Robert Axle Project Kid Trailer Thru Axle?

15 stores we checked sell it, including AMG Cyclery, Tree Fort Bikes, Two Wheeler & Ski Dealer, Performance Bicycle, Encina Bicycle Centers.

Best price now

$51.99at Tree Fort BikesChecked Nov 9

Compared across 15 stores. Prices are checked against each store and labelled with when.

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What reviewers say

Owners of thru-axle bikes rate it as the clean solution for towing a child trailer, and most praise the fit and build. Complaints center on ordering the wrong thread pitch or length and on the hitch being sold separately.

What people mention

FitMixedBuyers say it works well when the thread pitch and length match, but some order the wrong size.
BuildPraisedOwners describe the machining and stainless stud as sturdy and durable.
SetupPraisedInstallation with a 5mm Allen wrench is reported as quick and simple.
HitchMixedIt accepts common trailer hitches, but the hitch itself is not included.
RemovalCriticisedRemoving it needs a wrench, which is less convenient than a quick-release.

About the Robert Axle Project The Robert Axle Project Kid Trailer Thru Axle

The Kid Trailer Thru Axle lets you attach a hitch-mount style trailer to any bike with a thru axle. It works with hitch-mount trailers common with child carriers, such as Thule/Chariot, Burley, InStep and Croozer. The hitch from the trailer manufacturer is used with it. A hitch is not included.

The axle is machined and tested in the USA. Its stainless steel end has an M10x1 threaded stud that accepts hitches from popular trailers. It comes with a 6mm thick flat spacer. The axle is 180mm long without the spacer and 174mm long with it.

It is installed or removed with a 5mm Allen wrench.

Material

Stainless steel axle end

Length

180mm, or 174mm with the spacer

Stud

M10x1 threaded stud

Thread pitch

1.75mm

Tool

5mm Allen wrench

Compatibility